我在变量中有一些值（以逗号分隔）。 我想逐个在数据库中插入这些值

My Code is given below :

$trend=5,6,7;
$variableAry=explode(",",$trend); 
            foreach($variableAry as $var)
            {
    $sql="insert into trending_lawyer(id,lawyers_id)values('','$var')";
    $query=mysql_query($sql);
}

Please suggest me to what to do/modify in this code to insert values in database.